Furnace.



P. V.-KNAUSS.

FURNACE. urmonnoiw rum) Nov. 16, 1908.

923,976. Patented June 8,1909.

FRANK V. KNAUSS, OF PORTSMOUTH, OHIO.

FURNACE Specification of Letters Patent.

Application filed November 16, 1908.

Patented June 8, 1909.

Serial No. 462,833.

To all whom it may concern:

Be it known that I, FRANK V. KNAUss, a citizen of the United States,residing at Portsmouth, in the county of Scioto and State of Ohio, haveinvented certain new and useful Improvements in Furnaces, of which thefollowing is a specification.

My invention relates to an improvement in furnaces, primarily forhot-air systems.

The object of the invention is to provide a chamber interposed betweenthe pipe and the outlet of the combustion chamber which shall be incontact with the air space and which shall expose a substantially largeradiating surface, whereby the products of combustion in escaping areutilized at the top of the air jacket, thereby giving added efficiencyto the furnace.

The features of the invention are more fully set forth in thedescription of the accompanying drawings, forming a part of thisspecification, in which Figure 1 is an elevation of a furnace with thecasing cut away to illustrate the interior. Fig. 2 is a central verticalsection of the flue dome. Fig. 8 is an enlarged plan View of the lowersection of the same. Fig. 4 is an enlarged detail sectional view,illustrating the manner of connecting the two sections forming the fluedome.

1 represents the outer shell within which is the combustion chamber 2,forming between them the compartments 8, in which the air to be heatedis exposed to the radiating surfaces of the combustion chamber.

4 represents the outlet of the combustion chamber for the products ofcombustion.

My attachment preferably consists of two shells 5, 6, forming an annularshell. The under side is provided with the flange 7, fitting the outlet4. This shell is substantially of the diameter of the combustion chamberand has the curved formation constituting the most efiicient form ofradiating surface. 8 to which the flue pipe 11 is attached, extendingthrough the jacket 1. The upper surface of the shell is convex on theinterior and constitutes a deflecting surface 14, adapted to throw theproducts of combustion radially outward toward the walls of the shell.

The sections 5, 6, are provided respectively with segmental walls 9, 10,which together form a segmental partition interposed between theinterior of the shell and This shell has a lateral outlet neck theoutlet 8. This segmental partition is substantially alined with theadjacent portion of the outlet 4, and this formation provides an outletupon opposite sides of this partition, so that the products ofcombustion may escape into the neck 8 by following a path conforming tothe periphery of the shell. In operation the products of combustion passinto this shell and are prevented from directly escaping, because of thepartitions 9, 10, and striking the deflecting surface 14 are thrown outto the periphery of the shell, moving along the periphery thereof,imparting their heat units thereto, until finally passing around theends of the partition they escape through the outlet 8. The products ofcombustion are thus maintained in the system without in any wiseeffecting the efficiency of the draft and they impart heat units to asupplemental heater having a substantial radiating area at the top ofthe air jacket. This device adds materially to the efficiency of thefurnace, makes a convenient attachment, allowing the joining of pipe anddamper outside of the casing, the neck 8 may be turned radially at anyangle on the furnace, and at the same time is substantially simple andinexpensive.

Having described my invention, I claim:

In combination with a combustion chamber and jacket of a furnace,forming an air space between them, a relatively restricted outlet fromthe combustion chamber, a supplemental heating chamber of relativelylarger diameter communicating with said outlet and occupying a positionat the top of the air jacket and exposing a substantial radiatingsurface, a lateral outlet from the supplemental chamber, and a segmentalpartition in the chamber alined with the combustion chamber outletvertically and laterally adjacent the outlet from the supplementalchamber, the top of said chamber having a convex surface, adapted todeflect radially the products of combustion, whereby the products ofcombustion are prevented from direct escape and are utilized in heatinga supplemental radiating area at the top of the air jacket,substantially as described.

In testimony whereof, I have hereunto set my hand.

FRANK V. KNAUSS. Witnesses:

FLOYD L. SMITH, HENRY Soor'r, Jr.

